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Fieldbus
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Fieldbus

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  1. Fieldbus Accessing all Areas

  2. Scope of presentation Safe Area Applications Non-Arcing Systems Zone 2 Non-Incendive Systems Zone 2 FNICO Zone 2,1,0 Intrinsic Safety Systems FISCO

  3. Non-hazardous area Fieldbus Host T T 18-30 volt Power Generalised Fieldbus connection Hub • General fieldbus application in safe area • terminated at both ends of bus

  4. Non-hazardous area Fieldbus Host T T 18-30 volt Power Non-hazardous area Hazardous area Fieldbus Host T T T T Generalised Fieldbus connection Hub • Need for hazardous area protection • suitable certified interface applied

  5. For general purpose applications in 31.25 kbit/s fieldbus systems terminate at both ends of fieldbus switched internal terminator option Isolated power conditioning 19V, 350mA output Suitable for Safe Area & Hazardous Area applications Certified for installation in Zone 2 hazardous areas Needs suitable certified interface eg, MTL791, for intrinsically safe field connection MTL5995 Power Supply ATEX II 3 G EEx n A IIC T4

  6. Redundant Fieldbus Power System • Backplane connects to : • bus terminator • input power supplies • host system • fieldbus trunk • alarm circuitry • Load sharing by redundant supplies • Up to 8 units may be daisy-chained • with common alarm • carrier jumper supplied • version without segment terminator available

  7. Fieldbus Host T System Alarm Supply ‘A’ Supply ‘B’ 18-30 volt Power Fieldbus Redundant Fieldbus Power System • Power Conditioning • high impedance to fieldbus network • Redundant DC Power Inputs • Power Isolation to fieldbus • 250 V ac galvanic isolation • Redundant Output Power • 25 Volt, 350mA output per module • LED indicates bus is powered • Hot-swappable • modules & / or input supply can be replaced without affecting fieldbus operation • Alarm Circuitry • input power or unit failure • galvanic isolation from other functions • Certification • FM Class 1 Div2 • ATEX II 3 G EEx nA IIC T4 • Zone 2 Mounting

  8. Common connections within addressing limitations Fieldbus Host Fieldbus Host System Alarm T T Supply ‘A’ Supply ‘B’ 18-30 volt Power Fieldbus Fieldbus Redundant Fieldbus Power System

  9. Redundant Fieldbus Power System • Note : • the fieldbus connection is certified as non-arcing EEx nA IIC T4 • It is NOT a FISCO / FNICO field connection • an added interface would be necessary to achieve this end

  10. Hazardous area Safe area MTL5053 T T 31.25kbit/s fieldbus MTL5053 Isolator / Power Supply • The MTL5053 extends 31.25kbit/s fieldbus networks into hazardous areas • Provides power to the highway & for communication to field devices • Separate power may be required for safe-area field devices • Supply voltage 20 to 35Vdc • Isolation : 250V ac between • safe area fieldbus circuits • hazardous area fieldbus circuits • power supply • Provides 18.4 volts at max 80 mA • Safety description 22V, 102, 216mA • Isolator transparent to fieldbus, hence termination at isolator is not a pre-requisite • Switchable safe area terminator Ex II (1) GD [EEx ia] IIC

  11. Safe Area system NA system NI system Some definitions Zone 2 Zone 1 Zone 0 Safe area Division 2 Division 1 Non-Arcing Systems Non-Incendive Systems

  12. Ethylene group Propane group Methane group Hydrogen group The principle of live working Limit the energy in the circuit Current Power = volts x amps Resistive Curves Voltage

  13. Hydrogen group 230 mA Apply a Safety Factor 24 Volts Safety Factor Unity : Zone 2 1.5 : Intrinsic Safety Fault-tolerant components not required for Zone 2 Current Resistive Curves Voltage

  14. NON-ARCING CIRCUITS : • High energy & mains circuits • No systems concept • Not live-workable Types of circuit in Zone 2 NON-INCENDIVE CIRCUITS : Energy-limited • Unity Safety Factor • Low energy circuits • Systems concept • Live-workable • User must NOT permit arcing

  15. Safe Area system NA system NI system IS system Zone 0 system Complete hazardous area capability Safe area Zone 2 Zone 1 Zone 0 Unclassified location Division 1 Division 2

  16. Max output : • 32 V • 1.5 A • MTL5995 • FPS-I Safe Area or Non Arcing Installation • Live working NOT permitted in a hazardous area • Installation in => IP54 ‘nA’ • All trunks & spurs • EEx nA IIC T4 • Vmax 32 V • Imax 1.5 A ‘nA’ • System Certification : • Ex nA IIC T4 • Class 1, Div 2, Groups A,B,C,D, T4 • FF-816 specification : • 32 V • 1.5 A • Terminator : FBT-1 • Vmax 32 V

  17. Max output : • 32 V • 1.5 A • MTL5995 • FPS-I Non Incendive / ‘Spurguard’ legs • Live working NOT permitted on ‘nA’ trunk • Installation in => IP54 ‘nA’ • Main trunks : • EEx nAL IIC T4 • Vmax 32 V • Imax 1.5 A ‘nL’ • Spurguard legs : • EEx nL IIC T4 • Vmax 32 V • Imax 60 mA ‘nA’ ‘nL’ • Live working safe on ‘NI’ spurs • System Certification : • Ex nA [nL] IIC T4 • Class 1, Div 2, Groups A,B,C,D, T4 • FF-816 specification : • 32 V • 1.5 A • Terminator : • Vmax 32 V

  18. Non Incendive System • Live working permitted throughout • Installation in => IP54 • MTL9111 • Max output : • 14 V • 233 mA ‘nL’ ‘nL’ • All trunks & spurs • EEx nL IIC T4 • Vmax 14 V • Imax 233 mA ‘nL’ • MTL9112 option for IIB with appropriate safety parameters ‘nL’ • System Certification : • Ex nL IIC T4 • Class 1, Div 2, Groups A,B,C,D, T4 • Terminator : • Vmax 32 V

  19. Non Incendive >> ‘Spurguard’ legs • Live working permitted throughout • Installation in => IP54 • MTL9111 • Max output : • 14 V • 233 mA ‘nL’ • All trunks & spurs • EEx nL IIC T4 • Vmax 14 V • Imax 233 mA ‘nL’ • Spurguard legs • EEx nL IIC T4 • Vmax 14 V • Imax 60 mA ‘nL’ • MTL9112 option for IIB with appropriate safety parameters ‘nL’ • System Certification : • Ex nL IIC T4 • Class 1, Div 2, Groups A,B,C,D, T4 • Terminator : • Vmax 32 V

  20. into Zone 0 Intrinsically Safe (Non-FISCO) Installation • Live working permitted throughout • Installation in => IP54 ‘IS’ • MTL5053 ‘IS’ • Available output : • 18.4 V 80 mA • Safety parameters : • 22 V 216 mA ‘IS’ ‘IS’ • System Certification : • Ex ia IIC T4 • Class 1, Div 1, Groups A,B,C,D, T4 • Terminator : • Vmax 24 V • Imax 250 mA • FF-816 specification : • 24 V • 250 mA

  21. FISCO

  22. Intrinsically Safe (FISCO) Installation • Live working permitted throughout • Installation in => IP54 ‘IS’ • MTL9121 IS : IIC • 14.0 V • 180 mA • MTL9122 IS : IIB • 14.8 V • 380 mA ‘IS’ • Megablock rating : • Vmax 14.8 V • Imax 380 mA ‘IS’ ‘IS’ • System Certification : • Ex ib IIC T4 • Class 1, Div 1, Groups A,B,C,D, T4 • Use in appropriate gas group • Limited to Zone 2 & 1 • All devices to be approved for FISCO • Terminator : • Vmax 24 V • Imax 250 mA

  23. Network Calculations

  24. T T T T Multiple power supply configuration Host • Sufficient current capacity ?

  25. T T T Basic configuration 9121 & 9122 Host L N E 24V supply Host trunk 2- 3+ 4- 5 S 6+ T Safe Area 7+ 8 S 9 - Zone 1 / Div1 Hazardous Area 6 devices (120 mA) in IIC 13 devices (260 mA) in IIB if 20 mA consumption each device

  26. T T T T • The Fieldbus signal, which is superimposed on the IS voltage, is fed via the interface device to & from the field devices • The 24 volt power supply is converted to an intrinsically safe supply to feed the IS trunk Host Power & data L N E 24V supply 2- 3+ 4- 6+ Safe Area 7+ 8 S 9 - Zone 1 / Div1 Hazardous Area

  27. 8913 8914 Power Units Zone2 / Div2 Mains 5991 Power Unit T T T T Safe Area Mains Mains or 24-volt power supply Host Power consumption 9121 : 190mA 9122 : 300mA 8914 : 10 A 5991 : 2 A

  28. Model Apparatus Useable Number Class Output V mA 9121-IS IIC 12 120 9122-IS IIB 12.8 260 Design Parameters • System design determined from : • power supply output voltage • power supply available current • knowledge of current consumption of each field device • survey shows a range of 10 to 28 mA • 20 mA is assumed • application of Ohm’s Law to the cable network • assessment for adequate voltage at each field device • Line resistance of 50 /km is assumed • within the FISCO range of 15 to 150 /km Parameter Value Loop resistance 15 ohm to 150 ohm / km Loop inductance 0.4 mH to 1 mH / km Capacitance 80 nF to 200 nF / km Spurs are in addition to permitted maximum cable length FISCO cable parameters

  29. Model 9121-IS : IIC Useable Output V mA 12 120 3 volts 100 mA Hydrogen Gas Group Typical IIC calculation 5 connected field devices at end of trunk Eg :  I = 100 mA 600 metres 30  = 3 volts 12 volts If current drawn < 20 mA then instrument population can be increased 600 metre IS trunk 30m spur = 1.5  carrying 20 mA volt drop = 30 mV 9 volts NODE each instrument draws 20 mA 600 metre IS trunk T

  30. Model 9121-IS : IIC Useable Output V mA 12 120 T 9.25 V Hydrogen Gas Group Typical IIC calculation 5 distributed field devices 12 volts  I = 100 mA 12.5  = 1.25 volts each instrument draws 20 mA 250 metres 10.75 V  I = 80 mA 12.5  = 1.0 volt 250 metres 9.75 V  I = 40 mA 12.5  = 0.50 volts 250 metres 750 metre IS trunk

  31. Model 9122-IS : IIB Useable Output V mA 12.8 260 3.8 volts 240 mA Ethylene Gas Group Typical IIB calculation 12 connected field devices at end of trunk  I = 240 mA = 3.8 volts drop thru 316 metres of 15.8  12.8 volts 316 metres 316 metre max IS trunk 12 instruments each drawing 20 mA 9 volts NODE Trunk length will increase if device population is reduced T

  32. 24 volts Power, Repeater & Ex protection Power drawn in either direction 1.8 kms 316 metres 24 volts Power Supply as a IIB Repeater Safe Area Zone 2 / Div 2 Zone 1 / Div 1 316 metres Power & Ex protection only 12 instruments Cable protection required A similar scenario exists for a IIC repeater

  33. Power drawn in either direction Power Supply as a Repeater Safe Area Zone 2 / Div 2 Zone 1 / Div 1 • Host probably has no Ex protection in powering the 912x device : • Cable is a non-arcing circuit due to incendive level of energy • Cable protection required - hazardous area wiring may not be disconnected to reveal floating wires • Repeater terminals carry limited energy; hence circuit is non-incendive and power plug may be removed • 912x device may power host equipment (max 30 mA) and power plug may be removed Power, Repeater & Ex protection 1.8 kms

  34. The ‘CE’ Mark Confirms compliance with all relevant Community directives Conformite European ex The ‘Explosive Atmosphere’ Mark Confirms compliance with ATEX or previous Flammable Atmosphere Directive ATEX Certification

  35. Referenced to ambient of -20 to +40 OC unless indicated as above • Temperature Class (Group II) • Apparatus Group (Hydrogen) T1 : 450 OC T2 : 300 OC T3 : 200 OC T4 : 135 OC T5 : 100 OC T6 : 85 OC • Type of protection code • Explosion protection symbol • Conformity with European Standard Equipment Marking - 9121 Power Supply CENELEC / IEC [E Ex ib] IIC T4 -40 OC < Tamb < +70 OC

  36. Referenced to ambient of -20 to +40 OC unless indicated as above • Temperature Class (Group II) • Apparatus Group (Hydrogen) T1 : 450 OC T2 : 300 OC T3 : 200 OC T4 : 135 OC T5 : 100 OC T6 : 85 OC • Type of protection code • Explosion protection symbol • Conformity with European Standard Equipment Marking - 9121 Power Supply CENELEC / IEC [E Ex ib] IIC T4 -40 OC < Tamb < +70 OC [ ] indicates the apparatus is safe area mounted ‘associated apparatus’ suitable for connection to Ex ib equipment

  37. G : Gas, vapour, mist D : Dust 0600 • Type of explosive atmosphere (Group II) II (2) GD M1 : energised M2 : de-energised 1 : Zone 0, 20 2 : Zone 1, 21 3 : Zone 2, 22 • Equipment Category I : Mining II : Non-Mining • Equipment Group • EU Explosive Atmosphere Symbol • Ref to Notified Body responsible for testing • CE mark Equipment Marking - 9121 Power Supply ATEX

  38. 0600 II (2) GD 9121 - BASEEFA Certification ATEX [E Ex ib] IIC T4 -40 OC < Tamb < +70 OC CENELEC / IEC BAS 02 ATEX 7276 EC-type examination certificate ATEX Category 2 certification • Additional information on product : Safety parameters, where applicable Year of manufacture & Serial No. Name & address of manufacturer Manufacturers type identification

  39. II 3 GD 9121 - MTL Declaration of Conformity ATEX E Ex nA IIC T4 -40 OC < Tamb < +70 OC CENELEC / IEC MTL 02 ATEX 9121X MTL Declaration of Conformity ATEX Category 3 certification justifying mounting the 9121 power supply in Zone 2 9121X refers to special conditions of use : > power supply is installed in an appropriate enclosure > it must be protected from large supply transients

  40. 0600 II (2) GD 9122 - BASEEFA Certification ATEX [E Ex ib] IIB T4 -40 OC < Tamb < +70 OC CENELEC / IEC BAS 02 ATEX 7277 EC-type examination certificate ATEX Category 2 certification

  41. II 3 GD 9122 - MTL Declaration of Conformity ATEX E Ex nA IIB T4 -40 OC < Tamb < +70 OC CENELEC / IEC MTL 02 ATEX 9122X MTL Declaration of Conformity ATEX Category 3 certification justifying mounting the 9122 power supply in Zone 2

  42. YES 9321-SC Fieldbus Intrinsically Safe Concept (FISCO) • Adopting FISCO raises the issue : • Can Entity certified fieldbus equipment (non-FISCO) be incorporated into a FISCO network ? 9323-SC

  43. I.S. Entity Spur Connections (non-FISCO devices) 9321-SC Zone 1 Entity IS certified device 9121-IS : IIC output safety parameters : 14 V; 180 mA; 2.52 W deliver 12.0 V; 110 mA 9321-SC Entity spur connector EEx ib IIC T4 II 2 (2) G Live working throughout FISCO devices HUB Entity device to FF-816 has an input safety description of 24 V; 250 mA; 1.2 watts T

  44. YES 9322-SC Fieldbus Intrinsically Safe Concept (FISCO) • The use of active current limitation restricts the categorisation to ‘EEx ib’, ie, connection to Zone 1 only • Can a fieldbus device be installed in a Zone 0 by adding further protection to achieve ‘ia’ status ?

  45. 9322-SC Zone 1 ia : Zone 0 energy limit Zone 0 T Networking into Zone 0 9322-SC Zone 0 spur connector Useable with either 9121-IS : IIC 9122-IS : IIB II 2 (1) G EEx ib IIC T4 II (1) G EEx [ia] IIC FISCO devices NODE

  46. Wiring Components

  47. Wiring Components - Megablock Series • Megablocks : • DIN-rail mounting Fieldbus network hubs • connect multiple field devices to trunk network • minimise hand wiring • network integrity maintained during connection / disconnection of individual devices • LED indicates minimum 9 volts present at hub • Megablocks available in 2, 4 & 8-way (10-way) versions • Megablock terminator available Terminator • Short-circuit protection option using SpurGuard

  48. Megablock Series Trunk / Home run Power LED >= 9V Field device connection Optional SpurGuard short circuit protection - visual indication of fault Trunk / Home run Securable, pluggable connectors 8-way Megablock

  49. 4 + 8 drop = 12 drop Easy to retrofit Junction box for specific application Megablock Series Choice of junction box Use site standard suitable for environment trunk standard instrument cable spur terminator

  50. Relcom SpurGuards™ • System reliability and availability may be affected • by the shorting of the fieldbus highway, • by the failure of any individual fieldbus device, • thus interrupting data communication across the entire bus segment • could occur during installation or routine instrument maintenance • A SpurGuard™ is a current-limiting device that provides short circuit protection to the fieldbus segment • By attaching a SpurGuard™ at each point where a field device is attached to the segment home run cable, isolation of the network from individual device failures is achieved • SpurGuards™ are available with any Megablock • a red LED indicates when a SpurGuard™ is providing overcurrent protection • Because a SpurGuard™ leg draws power from the segment when in short circuit mode, their short circuit current consumption must be taken into account during segment design • The SpurGuard™ short-circuit current is nominally 60 mA • Trunk to Spur max. voltage drop = 0.4 volts